#666F94
Closest named color: Metallic Blue (#4F738E). oklch(54.9% 0.059 273.7), rgb(102, 111, 148).
Aa
White text reads best on this color (4.92:1).
About this color
#666F94 is a medium-dark, muted blue. In OKLCH its lightness is 55%, its chroma 0.059 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.034 away. White text reads best on it, at 4.92:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | muted (0.059) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 4.26:1 |
| White text | 4.92:1 |
Values
| HEX | #666F94 |
| RGB | rgb(102, 111, 148) |
| HSL | hsl(228, 18%, 49%) |
| OKLCH | oklch(54.9% 0.059 273.7) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #666F94 | 4.92:1 | AA | Lc -79.5 | Fine for body text |
| Black text on #666F94 | 4.26:1 | AA large text | Lc 30.0 | Dividers and decoration only |
| #666F94 text on white | 4.92:1 | AA | Lc 74.1 | Content text, not long reading |
| #666F94 text on black | 4.26:1 | AA large text | Lc -27.6 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#F5F5F8
oklch(97.1% 0.004 286.3)
-
Step 100
100
#E8EAEF
oklch(93.7% 0.007 268.5)
-
Step 200
200
#D6D9E3
oklch(88.6% 0.014 272.7)
-
Step 300
300
#BBC0D2
oklch(80.9% 0.026 273.4)
-
Step 400
400
#989FBC
oklch(70.7% 0.043 274.6)
-
Step 500
500
#7F88AB
oklch(63.2% 0.054 273.5)
-
Step 600
600 (this color)
#666F94
oklch(54.9% 0.059 273.7)
-
Step 700
700
#575F80
oklch(49.2% 0.054 273.7)
-
Step 800
800
#474D68
oklch(42.6% 0.046 274.6)
-
Step 900
900
#3B4055
oklch(37.6% 0.037 274.1)
-
Step 950
950
#232632
oklch(27.1% 0.023 273.8)
#666F94 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #647296 | 0.008 |
| Deuteranopia (no green cones) | #606F93 | 0.009 |
| Tritanopia (no blue cones) | #5A767C | 0.052 |
| Achromatopsia (no color) | #707070 | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #666F94
#666F94
oklch(54.9% 0.059 273.7)
- #7C7149
#7C7149
oklch(54.9% 0.059 94.6)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #666F94, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.034
- Dull Blue #49759C ΔE 0.037
- Stormy Blue #507B9C ΔE 0.040
- Grey Purple #826D8C ΔE 0.043
- Grey Blue #647D8E ΔE 0.045
- Battleship Gray #6C757D ΔE 0.046
- Cerulean #457B9D ΔE 0.047
- Muted Blue #3B719F ΔE 0.051
Use #666F94 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.